Which of the following compounds lacks iron?

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(D) Hemoglobin,myoglobin,and cytochromes are all iron-containing compounds. Hemoglobin and myoglobin are heme proteins that transport or store oxygen,

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Chlorophyll

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(D) Hemoglobin,myoglobin,and cytochromes are all iron-containing compounds. Hemoglobin and myoglobin are heme proteins that transport or store oxygen,while cytochromes are iron-containing hemoproteins involved in the electron transport chain. Chlorophyll,the green pigment in plants,contains a magnesium $(Mg^{2+})$ ion at the center of its porphyrin ring,not iron.

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